Add assembly manager back into tools menu on jbrowse-desktop

[cmdcolin]

Was missing. still available in admin-server on web

[codecov]

Codecov Report

Merging #2461 (a6b45ef) into main (6af6da5) will increase coverage by 0.02%.
The diff coverage is 0.00%.

@@            Coverage Diff             @@
##             main    #2461      +/-   ##
==========================================
+ Coverage   61.18%   61.20%   +0.02%     
==========================================
  Files         539      539              
  Lines       25057    25059       +2     
  Branches     5849     5849              
==========================================
+ Hits        15330    15337       +7     
+ Misses       9409     9404       -5     
  Partials      318      318              

Impacted Files	Coverage Δ
products/jbrowse-desktop/src/rootModel.ts	0.00% <0.00%> (ø)
...nts/src/SNPCoverageRenderer/SNPCoverageRenderer.ts	80.24% <0.00%> (-7.41%)	⬇️
...gFeatureRenderer/components/ProcessedTranscript.js	86.48% <0.00%> (+1.35%)	⬆️
...gins/svg/src/SvgFeatureRenderer/components/util.ts	98.03% <0.00%> (+1.96%)	⬆️
packages/core/TextSearch/TextSearchManager.ts	100.00% <0.00%> (+3.44%)	⬆️
...inearGenomeView/components/RefNameAutocomplete.tsx	86.02% <0.00%> (+10.75%)	⬆️

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[cmdcolin]

Note that if you add an assembly, and want to edit refNameAliases later, it will not be possible with this PR/on main

It is actually fixed by assembly config schema changes in #2267

[cmdcolin]

we could also consider adding a refnamealiases slot for when the user is initially adding the assembly perhaps also